# Electromagnetic Induction

1. May 6, 2008

### Icetray

Hi,

I am learning Electromagnetic Induction in school and I have this question. For a straight conductor with length l and velocity v, that cuts through a uniform field, it can be seen that an emf is induced and this emf can be calculated using the equation E = Blv.

However, I would like to know what happens as the length of the conductor is increased. Through he equation, I can see that the emf increases but is there a more precise answer/ way of explaining it?

2. May 6, 2008

### Mindscrape

What is the exact situation? So far what you have described seems wrong in that if the magnetic field is uniform then the magnetic flux will be constant. I imagine that the magnetic field is only uniform only a certain region. You probably also need a minus sign in your formula, but whatever.

As far as your question of conceptualizing the whole thin goes, you should think about the flux. Flux represents the amount of the magnetic field going through a certain area. If you have more area, then you'll have more flux, and more EMF.

$$EMF = - \frac{d \Phi}{dt}$$